Orthographic views of the Q (left) and U (right) maps at 353 GHz. From top to bottom: Planck PR3 data and best-fit maps corresponding to the modeled shapes of the LB shell obtained from the L19 3D extinction map, with l_max = 2, 4, 6, 8, and 10. The background structures underlying the maps come from the dust column density taken from the data. Units are MJy sr⁻¹. In orthographic views, the North and South Galactic Poles lie at the center of the left and right circles, respectively, the vertical solid radius shows longitude 0°, and the left and right panels touch at l = 90°. The gray area corresponds to the region |b| < 60°, which is notconsidered in the fitting procedure.